Bobbin-controlling device.



W. N. PARKES.

BOBBIN CONTROLLING DEVICE.

APPLICATION mgr), MAY u, 19m.

1,181,1 6Q. Patented May 2, 1916.

manner with a tension device actin un -"ran sra'rns PATENT OFFICE.

WILLIAM N. PARKES. 0F BROGKLYI-I, NEW YORK, ASSIGNOR TO TH'E'MNGEIQMANU- FACIURIHG (DOMPANY, A CORPORATION OF NEW JERSEY.

BOBBIN-CONTROLLING DEVICE.

Specification of Letters Patent.

Patented May 2, 1916.

To all whom it may concern:

Be it known that I, Wni'cmar N. PARKES, a citizen of the United States,residing at Brooklyn, in the county of Kings and State 5 of ew York,have invented certain new and useful Improvements in BobbiInC/ontroliingDevices, of which the following is a specification, reference being hadtherein to the accompanying drawings.

In my patent applications Serial Nos. 835,843 and $35,8ii, filed May 2,1914, I have shown a loop-taker comprising a rotary loop-seizing memberhaving a threadrase journaled therein and provided With an es- 5capeinent device for restraining the same against rotation whilepermitting the needle-thread loops to be freely cast about the lowerthread The thread-case of the said applications is provided in the usualupon the lower thread drawn from the ho bin.

In certain classes of work, and under cer tain conditions, it has beenfound undesirable to apply a continuous tension to the lower thread. andmy present invention has for its object to dispense with such constanttension and to apply a yielding resistance to the delivery of thebobbin-thread only at certain stages of the stitch-forming cycle,

and particularly during the setting of the stitches? In the preferredembodiment of the. pres ent improvement, the bobbin-case holder,comprising a rocking yoke with convergently directed lingers at theextremities of its component arms for alternate engagement with thebobbin-case, has yieldingly mounted thereon a bobbin-controlling fingeradapted to periodically enter the bobbin cavity of the thread-case forengagement with the rim of the bobbin-flange. By this means a yieldingresistance is offered to the rotation of the bobbin and hencea drag isimposed upon the lower thread under the 5 action of the take-up upon theupper thread in setting the stitches.

T he invention will he understood by reference to the i-iccoinpanyingdrawings, in which Figure 1 is an elevation of a part of; the sewingmachine containing the stitch form ing mechanism, partly insection; andFig. 2- is a front end elevation of the same with the bed-plate intransverse section. ii 3 is an 5 end elevation showing the loop-takerand the bobbin-case holder and bobbin controlling arm. Fig. 4 is aperspective view of t e bobbin controlling arm. Fig. 5 is a sectionalelevation on line 5-5 of Fig. 1 showing the actuating means for thebobbin-case holder and bobbin cont-roller.

The machine is shown constructed with the usual bed-plate 1beneathlwhich is journaled the rotary loop-taker shaft 2' ufi'ontheforward end of which is fixed the cupshaped lo0pseizing member 3 formedwith the beak 4 and provided with a central tln-ead-cavity in which isjournaled the bobbin-case 5. The bobbin-case is constructed with anaxial thread-cavity having disposed centrally thereof thebobbinsustaining post (3 upon which is journaled a wellknown form ofdisk-bobbin formed with a tubular hub portion and end-flanges 7, beingconfined in position thereon by the latch 8.

The outer end of the thread-case is provided with the forwardlyprojecting lugs 9 having transverse notches 10 adapted to be entered bythe convergently arranged and opposed fingers 11 of the rockingescapement yoke 12 which receives a rocking movement for each rotationof the loop-seizing member or hook 3. This yoke constitutes, inconjunction with the notched lugs 9, an escapement by means of which thethread-case is restrained against rotation with the hook in a mannerwell known, the fingers 11, which are arranged concentrically with theaxis of motion of the yoke, being alternately retracted so as to permitthe free passage of the needle-thread loops in the loop-castingoperation. As represented in the drawings, a loop-guard flange 13sustained by the bobbin-case is formed With an the flange 20 to'which isrigidly secured the 195 yoke 12.

Fixed within the rearward end of the rock-shaft 19 is'the bushing 21having fitted therein the rearward end of a second rock" shaft 22 havingsecured upon its forward end by the transverse pin 23 the plug 24provided upon its outer extremity with the transverse tongue or rib '25.Secured upon the forward end of the plug 24 by means of the screw 26 isthe hub 27 of the curved bobbin-controller arm the hub 27 being formedwith a transverse notch or groove 29 entered by the rib of the plug 2t.The bobbin-controller arm 28 is provided upon its outer extremity withthe backwardly eX- tending lip 30 beveled at 31 upon the edge towardwhich the needle-thread loops are carried by the hook, or at the left asviewed from the front of the machine.

The inner [rock-shaft 22 is confined against endwise movement at one endby engagement of the hub 27 with the adjacent face of the yoke 12 and atthe other end by engagement of the washer 32, secured thereto by thescrew 33, with the end of the bushing 21. The two rock-shafts areresiliently connected together by means of the spring 34 surrounding theinner rock-shaft and having one end secured in the bushing 21 and theother in the plug 21, a stop-pin 35 engaging the controller arm 28 inoppo sition to the spring in the retracted position of said arm, asrepresented in Fig. 3.

Secured upon the rearward end. of the tubular rock-shaft 19 by means ofthe clampscrew 36 is the split hub 37 of a cranlcarm 38 formed with aforked extremity 3!) within which is fitted the slide-block 40 transversely apertured to fit the-actuating eccentric 41 upon the loop-takershaft By this means the rock-shaft 19 receives an oscillation for eachrotation of the loop-taker shaft.

In the operation of the machine, the needle 42 depends through thethroat-plate 43 and presents a thread-loop which is seized by the hookand carried backwardly and downwardly around the bobbin-case, the yoke12 being rocked to the left. as represcntcd in Fig. 2, to permit thefree passage of the thrcad-lco 'i. while the finger 11 at the oppositeside of the bobbin-case remains in engagement with the latter to detainit against rotation. In this position of the parts, the sidc-tacc ot'the lip 30 of the bobbin-controller which enters a depression 5 in theouter end of the bobbin-case. rests in contact with the rini of thebobbin-flange 7 under the action of the spring 34 and imposes a yieldingresistance. to the rotation of the bobbin. As the beak 4 of the hookcontinues its movement beyond cast-off position. as represented in l ig.2, aml passes bcncath the loop-guard 13, the yoke 12 is rocked towardthe front of the machine, as rcprcscntcd in Fig. 3. thereby retractingthe. holding lingcr ll at that side and advancing the other of saidfingers into operative cngagemcnt with the bobbin-cases. In thismovement of the yoke, the stop-pin 35 en gages the controller-arm 28 andretracts the same from engagement with the bobbin in opposition to thespring 31, whereby a free passage is afforded tor the needle-thread loopin being drawn by the take-up.

The present machine. as represented in the drawings, is one in which thehook performs two rotations for each reciprocation of the needle, and inthe succeeding rotation of the hook the described movements of thethread-case holding yoke 12 and the bobbin controlling arm 28 arerepeated.

In my Patent No. 875.613. of Dec. 31, 1907.,a friction device applieddirectly to the side-face of the bobbin is shown applied to a machineconstructed with a rotary hook turning upon a vertical axis. Suchconstruction is obviously unadaptcd for employment in a inachinc ot' thepresent form wherein the hook turns upon an axis disposed transverselyto the direction of reciprocation of the needle and the presentimprovement is designed particularly for embodiment in a rotary hookmachine of the latter type. The specific construction and arrangement ofthe component parts of the present bobbin-controlling means areevidently not material to the present invention, and may be considerablymodified within its scope.

Having thus set forth the nature of the invention, what I claim hereinis:

1. In a sewing machine. the combination with a rotary loop-seizingmember, and a bobbin-case journalcd therein and formed with an axialbobbin-cavity to receive a bob bin, of a bobbin controlling memberdisposed wholly at one side of the bobbin-cavity and movable toward andfrom said axis for cngagcmcnt with the. rim of the bobbin in saidcavity, and actuating means therefor.

In a sewing machine, the combination with a rotary lmip-scizing member,and a bobbin-case journalcd therein and formed with an axiallmbbin-cavity to receive a, bobbin. of a rcci 'n'ocatory holder forrestraining the bohbiircasc against movement with the loop-seizingmember, and 2. bobbin controller operatively connected tl cze with andadapted for yiclding engagement with a bobbin contained in saidbobbincavity.

3. In a. sewing machine, the combination with a rotary shaft. a.loop-seizing member thereon. and a bobbin-case journalcd in said memberand formed with a. cavity to receive a bobbin. of a rock-shalt disposedparallel with said rotary shalt. a liobbin-controllcr yicldinglysustaincd by said shaft and adapted to engagisaid bobbin. and actuatingmeans for said rock-shaft.

-'l. in a sewing machine, the combination with :i rotary shaft. :1loop-scizing member thereon, and a l)()lll)lll(i;k. 't journalcd in saidand. fimnad wiih. a cavity t0 receive n mmm mck siiaft, a b0bbinmam-43d\Ehwenn and adapted to Lwbbimcase fan restraining it ML a semndz'mkshaft j0urihe tubular reek-shaft, a b0ban imbbin-cuz-xn 'ZAv'it) toengage n r-nsilient, connection between In riwrii shnfis, and smtuatingmeans for mm? tannin! rmk-s'hnft f1. in ii sewing machine, time combinanmm a miury shaft, :2 kionseizing memiizez-mn, and a bahhin casejournaied in nwmner and fornmd with a cavitv to reiw 1, iifiifibi'fl ifa tubular rack-shaft, a; smurnd inerenn and zmn fixed thereon and adaptadapted to the bobbin-case for restraining it against miation, a secondrockshaft journalvd within the tubular rockshaft, 21 bobbin--cnntrailingarm fixed thereon and adapted to enter the bubbinuase saw ity to engagei110 bubbin, :1 sprin 7 surrounding the 5(\'.(lfl li-ikllk1t(iik'k-Filil t; and con nccted at opp: T 0 extremities with saidrock-shafts, respectively. and actuating means for said tn'nuinrlurk-shaft.

n testimony hereof, I have signal my name to this speciticatinn, in thepresence of two subscribing n itnesses.

WILLIAM N. PARKES. Witnesses HENRY J. MILLER, HENRY A. Knimmmnn, Jr.

